Merge pull request #64 from lidl/master

var postgres = require('pg');

var winston = require('winston');

// create table entries (id SERIAL primary key, key varchar(255) not null, value text not null, expiration int);

// CREATE UNIQUE INDEX unique_key ON entries (key);

// create table entries (id serial primary key, key varchar(255) not null, value text not null, expiration int, unique(key));

// A postgres document store

var PostgresDocumentStore = function (options) {